Braking device and method for operating a breaking device

Patent metadata

Field	Value
Publication number	US-2016229383-A1
Application number	US-201415022394-A
Country	US
Kind code	A1
Filing date	Sep 16, 2014
Priority date	Sep 16, 2013
Publication date	Aug 11, 2016
Grant date	—

Abstract

The invention relates to a brake device and a method for operating a brake device, wherein said brake device comprises an actuation device, also a booster device, in particular having an electro-hydraulic drive, a piston cylinder device (main cylinder) in order to supply hydraulic pressure medium to the brake circuits, a valve device for controlling or regulating the supply of the pressure medium and an electronic control or regulating device (ECU). According to the invention provision is made for additional pressure medium volume to be supplied in a controlled manner to at least one brake circuit by means of a further piston cylinder device, in particular a double stroke piston ( 10 ) and at least one valve (AS) controlled by the control or regulating device (ECU).

First claim

1 . An actuation device for a vehicle brake, comprising:
an actuation device in the form of a brake pedal, at least one piston cylinder unit which is connected to the vehicle brake via a hydraulic brake circuit to supply pressure medium to the brake circuit and to apply pressure on the vehicle brake, a drive for the piston cylinder unit, and at least one piston arranged to be driven by the drive, wherein said piston is arranged to supply pressure medium to at least one brake circuit in a controlled manner in both movement directions of the piston, prestroke and return stroke.

2 . The actuation device according to claim 1 , wherein the piston cylinder unit forms an annular space from which the pressure medium is enabled to be supplied to at least one brake circuit.

3 . The actuation device according to claim 1 , wherein the supply of the pressure medium takes place in at least one pressure chamber associated with pistons, of the piston cylinder unit.

4 . The actuation device according to claim 1 , further comprising valves configured to control supply of the pressure medium.

5 . The actuation device according to claim 1 , wherein the piston supplying the pressure medium in both movement directions is driven by an electric motor.

6 . The actuation device according to claim 1 , wherein volume control and injection in at least one brake circuit takes place via a return stroke of the piston.

7 . The actuation device according to claim 1 , wherein supply of the pressure medium by means of the piston in at least two brake circuits takes place simultaneously or serially, and wherein the actuation device further comprises a closing valve.

8 . The actuation device according to claim 1 , further comprising at least one securing valve provided in a supply line for the pressure medium.

9 . The actuation device according to claim 1 , further comprising a mechanical coupling in a fallback level and arranged for separating the drive and the piston driven by the drive.

10 . The actuation device according to claim 1 , further comprising a positioning sensor for the driven piston and configured for controlling supply of the pressure medium.

11 . The actuation device according to claim 1 , further comprising a reservoir configured to balance out supplied pressure medium volume.

12 . The actuation device according to claim 1 , wherein a diagnosis of valves and seals takes place during a normal operating process.

13 . The actuation device according to claim 1 , wherein pressure medium from a further piston-cylinder unit reaches the piston, which moves in both directions, by means of an auxiliary piston and via a valve.

14 . A double stroke piston for a hydraulic actuation device according to claim 1 , wherein the double stroke piston of the hydraulic actuation device is configured to supply pressure medium in both piston movement directions.

15 . The actuation device according to claim 1 , further comprising a housing extension is provided on a drive housing, said housing extension forming at least one outlet channel for leakage fluid.

16 . The actuation device according to claim 15 , wherein a separation chamber is formed in the lower part of the housing extension.

17 . The actuation device according to claim 15 , further comprising a fluid sensor arranged in a lower part of the housing extension.

18 . The actuation device according to claim 1 , wherein the piston cylinder unit and the drive are spatially arranged at least partially adjacent or parallel and are arranged in one unit.

19 . The actuation device according to claim 18 , wherein the drive acts on at least one pistons configured to move in both movement directions.

20 . The actuation device according to claim 1 , wherein the at least one piston arranged to be driven by the drive is configured as an annular piston, a working chamber of which is arranged in particular at least partially parallel to the piston-cylinder unit.

21 . The actuation device according to claim 1 , wherein pistons of the piston-cylinder unit are arranged in parallel.

22 . The actuation device according to claim 21 , wherein working chambers of the piston-cylinder unit are connected via a hydraulic line, in which a valve is connected.

23 . The actuation device according to claim 1 , wherein suction valves are associated with delivery directions of the piston.

24 . The actuation device according to claim 1 , further comprising an auxiliary piston, a working chamber of which is connected via a hydraulic line to a travel simulator, and a changeover valve arranged in the hydraulic line, said changeover valve connecting the working chamber of the auxiliary piston to that of the driven piston in a currentless manner.

25 . The actuation device according to claim 1 , wherein a piston of the piston cylinder unit is arranged parallel to a further piston of the piston cylinder unit, and wherein a solenoid valve is arranged in a hydraulic line connecting working chambers of the pistons.

26 . The actuation device according to claim 1 , wherein a piston of the piston cylinder unit is configured or is used as a double stroke piston, and further comprising isolation valves are arranged in lines leading to wheel brakes and suction valves arranged in lines leading to a reservoir.

27 . The actuation device according to claim 1 , wherein a free travel is provided between the brake pedal or a pedal plunger and a spindle or between a coupling plunger and the spindle, wherein the spindle is connected to the piston via a bending rod or a coupling.

28 . The actuation device according to claim 27 , further comprising, in addition to the piston cylinder unit, at least one further piston cylinder unit fixedly connected to the spindle and configured to deliver hydraulic medium in the at least one brake circuit in a return stroke.

29 . A method for operating a brake device, wherein said brake device comprises an actuation device having an electro-hydraulic drive, a main piston cylinder device to supply hydraulic pressure medium to brake circuits, a valve device for controlling or regulating supply of the pressure medium, and an electronic control or regulating device (ECU), the method comprising:
supplying pressure medium volume in a controlled manner to at least one brake circuit by means of a further piston cylinder device, including a double stroke piston, and at least one valve controlled by the control or regulating device.

30 . The method according to claim 29 , further comprising supplying additional pressure medium volume in a fallback level.

31 . The method according to claim 29 , wherein pressure medium volume is supplied using a pressure signal or a motor current of the piston stroke and a pedal speed.

32 . The method according to claim 31 , wherein in a case of low pedal speed, additional pressure medium volume is supplied with pressure in the range of 5 bar, and in the case of high pedal speed with a pressure in the range of 30 bar.

33 . The method according to claim 29 , wherein in particular in a case of a system with free travel in a range approximately greater than 3 mm, a volume loss caused by the free travel is partially or fully balanced out by injecting additional pressure medium volume.

34 .

Assignees

• Ipgate Ag

Inventors

• Leiber Heinz
• Leiber Thomas
• Unterfrauner Valentin
• Koglsperger Christian

Classifications

• B60T13/686 Primary

  in hydraulic systems or parts thereof · CPC title

• B60T2270/82

  Brake-by-Wire, EHB · CPC title

• B60T8/4077

  Systems in which the booster is used as an auxiliary pressure source · CPC title

• B60T13/745

  acting on a hydraulic system, e.g. a master cylinder · CPC title

• B60T8/4081

  Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence) · CPC title